Electric bell.



No. 646,222. Patentad Mar. 27, I900.

F. &. H. F. KEIL. I

ELECTRIC BELL.

(Application med Sept. 7, 1899.)

(No Model."

INVENTORS ATfOHA/EYS STATES PATENT Trio.

FRANCIS KEIL AND HENRY FRANCIS KEIL, OF- NEIV YORK, N. Y.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 646,222, dated March27, 1900.

- Application filed September 7, 1899- Serial No. 729,718. (No model.)

To all whom, it may concern.-

Be it known that We, FRANCIS KEIL and HENRY FRANCIS KEIL, of the city ofNew York, borough of Bronx,'in the county of New York and State of NewYork, have invented a new and ImprovedElectric Bell, of which thefollowingis a f ull,clear, and exact description.

This invention relates to improvements in electric bells; and one objectis to provide a bell so constructed that the armature may be turned awayfrom the electromagnet and the contact-pin when it is desired to cleanor adjust the spring-contact.

A further object is to provide a simple means for holding the dust capremovably in place over the magnet and armature, and another object isto provide a simple means for attaching the hammer-stem to the armature.

We will describe an electric bell embodying our invention and then pointout the novel features in the appended olaims.-

Reference is to be had to the accompanyin g drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a front elevation of a bell embodying our improvement with aportion of the dust-cap broken away. Fig. 2 is a side elevation with thedust-cap in section. Fig. 3 is a detail view showing the armature asturned away from the electromagnet. Fig. 4 is a section through the line4 4 of Fig. 1. Fig. 5 is a perspective view of a locking-section used inconnection with the armature.

Fig. 6 is a perspective view of the dust-cap. Fig. 7 is an elevationillustrating the manner of attaching the hammer-stem tothe armature, andFig. 8 is a section on the line 8 8 of Fig. 7.

Referring to the drawings, 1 designates the base of the bell-frame, andon which is mounted the electromagnet 2. Ooacting with the electromagnetis the armature 3, which is mounted on the contact-spring 4, adapted tomake and break connection with the contactscrew 5 in the usual manner.The end of the spring-1 is provided with a locking-section 6,

here shown as made in the form of a disk having radial corrugations.This lockingelectromagnet.

section 7 bears at its inner side against said lug 8, and from saidsection a spring-plate 9 extends over the end-0f the lug and along itsopposite side, the end of said spring-plate bearing against the lug. Abolt, ferrule, or rivet 10 passes through the spring-plate 9, the lug 8,and through the locking-sections, as plainly shown in Fig. 4. By thisconstruction it is obvious that the armature carrying the bell-hammerwill be held yieldingly in its normal position. It is also obvious thatthe armature may be turned transversely or outward relatively to theelectromagnet, as the yielding of the spring-plate 9 will permit thecorrugations of the locking-section 6 to ride over the corrugations ofthe locking-section 7, and this will be found very convenient inasmuchas the parts when separated may be more easily and readily cleaned whenfound necessary.

In attaching the shank 11 of the hammer 12 to the armature We providethe armature witha slot 13, the said slot being about onehalf the depthof the diameter of the shank. \Vhen the shank is placed in the slot bymeans of a suitable tool, portions of the opposite walls of the slot areturned in to'engage with the shank, as indicated at 14 in Fig. 7. As aportion of the hammer-shank extends inward or beyond the inner plane ofthe armature it will present a very small surface to come in directcontact with a core 'of the In other wordsfit will prevent the surfaceof the armature from com: ing in contact with the cores, which in timemight cause the armature to adhere to the cores.

The dust-cap 15 is made of resilient metal,

and around its edge it has an outwardly-extended flange 16, which willengage closely against the base 1 when said cap is in position. The onlyopening in the cap is the opening 17 through which the shank 11 passes.

The lower portion of this opening, however,

ICO

side is to be placed on one of the lugs and then the opposite wall. ofthe cap is to be pressed slightly inward to allow the flange at thatside to pass underneath the lug at that side. The cap as thus arrangedwill practically prevent the entrance of dirt and dust or of vermin, sothat the bell mechanism will not require cleaning, excepting at longintervals of time.

Having thus fully described our invention, we claim as new and desire tosecure by Letters Patent- 1. In an electric bell; an electromagnet, anarmature and a locking device, one section of said locking device beingattachedto the armature the other section being on a fixed support, anda spring-yielding connection holding the two locking-devicesectionstogether and whereby the armature is permitted to turntransversely of the eleotromagnet, substantially as specified.

2. In an electric bell; an electromaguet, an armature coactingtherewith, a locking-section attached to thearmature and consisting of aradially-corrugated disk, another looking-section consisting of aradiallycorrugated disk engaging with the first section, a support onone side of which the second-nan1ed locking section engages, aspring-plate eX- tended from said second-named locking-section to anengagement with the opposite side of the support, and a pin or boltextended through said spring-plate, the support and thelocking-sections, substantially as specified.

3. An electric device comprising an electromagnet, an armature coactingwith the ma net, a spring-plate to which the armature is attached, theend of said spring-plate being provided with radial corrugations, aplate or locking-section transversely corrugated for engaging with thefirst-named corrugated portion, a support against one side of which thelast-named corrugated plate engages,a spring plate extended from thelast-named corrugated plate and engaging with the opposite side of thesupport, and-a pin passing from the support loosely through the twocorrugated portions, substantially as specified.

4. In an electric bell, an electromagnet, an armature coacting therewithand mounted to turn, and automatic locking devices coacting with thearmature, the locking devices normally holding the armature in theadjusted position and at all times exerting a tendency to lock the same,the said devices however yielding to a turning movement of the armature, substantially as specified. FRANCIS KEIL. HENRY FRANCIS KEITJ.\Vitnesses:

HENRY F. SOHLENNAGER, HEINRICH BAMMANN.

